Clemson University noted that his results were preliminary, but did suggest antidepressants certainly appeared capable of deletariously altering the behavior of exposed fish. fathead minnows that venlafaxine - also known as Effexor - and other antidepressants had the potential to make males more aggressive when guarding a nest from a potential intruder.

Pfizer reported a 5.5% increase in second-quarter earnings on lower acquisition-related charges and a lower tax rate, while generic competition for antidepressant Effexor and other drugs pushed revenue down 1%.